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PostPosted: Tue Jun 23, 2015 7:55 am 
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BigDumbDinosaur wrote:
rwiker wrote:
BigDumbDinosaur wrote:
BigEd wrote:
(Works for me right now. To see if a problem is local or global, use http://downforeveryoneorjustme.com/)

It appears to be a problem with improperly configured DNS. The URL robotroom.com points to the IP address 72.167.131.23, which makes it an A record. The URL www.robotroom.com shows up in DNS as a CNAME record, not an A record as it should. I can reach the site via the robotroom.com URL only.


I think this is exactly the way it is supposed to be: the cname record makes http://www.robotroom.com an alias for robotroom.com (or robotroom.com the canonical name for http://www.robotroom.com).

It should be the other way around. 'A' records are supposed to point to specific machines.


No, that's incorrect - see https://en.wikipedia.org/wiki/CNAME_record


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PostPosted: Tue Jun 23, 2015 11:52 am 
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Bzzzzzzzz..... (sound of a Yak being shaved!)

Brad


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PostPosted: Tue Jun 23, 2015 9:14 pm 
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rwiker wrote:
BigDumbDinosaur wrote:
rwiker wrote:
BigDumbDinosaur wrote:
BigEd wrote:
(Works for me right now. To see if a problem is local or global, use http://downforeveryoneorjustme.com/)

It appears to be a problem with improperly configured DNS. The URL robotroom.com points to the IP address 72.167.131.23, which makes it an A record. The URL www.robotroom.com shows up in DNS as a CNAME record, not an A record as it should. I can reach the site via the robotroom.com URL only.

I think this is exactly the way it is supposed to be: the cname record makes http://www.robotroom.com an alias for robotroom.com (or robotroom.com the canonical name for http://www.robotroom.com).

It should be the other way around. 'A' records are supposed to point to specific machines.

No, that's incorrect - see https://en.wikipedia.org/wiki/CNAME_record

I think you are misunderstanding what the Wikipedia article is telling you. From the article:

    A Canonical Name record (abbreviated as CNAME record) is a type of resource record in the Domain Name System (DNS) used to specify that a domain name is an alias for another domain, the "canonical" domain. All information, including subdomains, IP addresses, etc., are defined by the canonical domain.

What this means is that www.bcstechnology.net should point to an IP address and hence be an 'A' record, whereas bcstechnology.net should point to a machine's fully-qualified domain name (FQDN) and hence would be a CNAME.

Please read farther down in the Wikipedia record and you will see a proper CNAME example:

Code:
NAME                    TYPE   VALUE
--------------------------------------------------
bar.example.com.        CNAME  foo.example.com.
foo.example.com.        A      192.0.2.23

The above conforms to RFCs 1034 and 2181.

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PostPosted: Tue Jun 23, 2015 9:19 pm 
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But being a cname or an A-record shouldn't matter for a browser in any case.


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PostPosted: Tue Jun 23, 2015 9:37 pm 
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Tor wrote:
But being a cname or an A-record shouldn't matter for a browser in any case.

You're correct. However, whatever is dishing out DNS information to the browser might have a problem with a CNAME pointing to an IP address instead of a machine name..

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PostPosted: Tue Jun 23, 2015 9:40 pm 
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Perhaps in future if one of us discovers a non-working link in a post, we can just send a PM to the poster?

Then we might avoid enormous digressions in technical threads.


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PostPosted: Wed Jun 24, 2015 1:34 am 
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AKA... "Shaving a Yak".

http://www.hanselman.com/blog/YakShavingDefinedIllGetThatDoneAsSoonAsIShaveThisYak.aspx

Brad

BigEd wrote:
Perhaps in future if one of us discovers a non-working link in a post, we can just send a PM to the poster?

Then we might avoid enormous digressions in technical threads.


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